Hmmm. That is exactly the same scheme used many years ago with the centrifugal 
governor to control a DC motor on an Arriflex movie camera. When the motor ran 
above the set speed the contacts shorted a coil on the rotating assembly which 
in turn reduced the power to the motor.

> -----Original Message-----
> From: andy pugh [mailto:bodge...@gmail.com]
> Sent: Tuesday, September 27, 2016 2:49 PM
> To: Enhanced Machine Controller (EMC)
> Subject: Re: [Emc-users] snagged touch probe on eBay - anybody know how to
> interface ?
>
> On 27 September 2016 at 19:09, Ken Strauss <ken.stra...@sympatico.ca>
> wrote:
>
> > I have no idea if this is the actual scheme used with the MP3.
>
>
> The MP3 is much simpler. There is a coil (possibly with a ferrite core) that 
> is
> completed by the probe contacts.
> That is in resonance with the detector when the probe contacts are closed, 
> and
> not when they are not.
>
> I assume there is the rest of an LC bridge circuit in the transmitter, an 
> oscillator,
> precision (op-amp) rectifier and level detector.
>
> --
> atp
> "A motorcycle is a bicycle with a pandemonium attachment and is designed for
> the especial use of mechanical geniuses, daredevils and lunatics."
> - George Fitch, Atlanta Constitution Newspaper, 1916
> ------------------------------------------------------------------------------
> _______________________________________________
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> Emc-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-users



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